Stop-watch.



ne. 768,986. Patented sept. te, |902.

M. AssoFF.

STOP WATCH.

(Applteetten med me? 12, 1902.)

(No ModeL.)

fu: Norms PETERS no. vuouumo., wAsHvNGmN, D, cv

UNITED STATES PATENT OFFICE.

MORRIS BASSOFF, OF BROOKLYN, NEV YORK.

STOP-WATCH.

SPECIFICATION forming part oi Letters Patent No. 708,986, dated September 16, 1902.

Application tiled May l2, 1902. Serial No. 106,872. (No model.)

Be it known that I, MORRIS BASSOFF, a citizen of the United States, residing atBrooklyn, in the county ot Kings and State ot New York, have invented certain new and useful Improvements inl Fly-Back Attachments for Vatches, of which the followingis a full and complete specification, such as will enable those skilled in the art to which it appertains to make and use the same.

The objectof this invention is to provide an improved ily-back attachment for watches for use in connection with what is known as a sweep seconds-hand and for the purpose of stopping and starting said hand whenever desired and for returning said hand at the expiration of any period of time to the point from which it was started without in any way interfering with the regular mechanism or movement of the watch.

The invention is fully disclosed in the following specitication, ot' which the accompanying drawings form a part, in which the separate parts of my improvement are designated by the same reference characters `in each of the views, and in which- Figure l is a plan view of one side of a watch mechanism and showing one of the outside plates of the framework thereof and the parts of my improvement connected therewith; Fig. 2, a view similar to Fig. l, showing the outside frame-plate of Fig. l removed and showing the opposite side plate and the parts of the operative mechanism of the watch which are necessarily used in connection with my improvement; Fig. 3, a partial section on the line 33 of Fig. l, showing both of the side plates of the frame of the watchwork mechanism and showing a part of said mechanism and the parts of my improvement, all of said parts heilig on an enlarged scale; Fig. et, a partial section on the line et i of Fig. l, on an enlarged scale; Fig. 5, a partial section ou the line 5 5 of Fig. l and 011 an enlarged scale; Fig. (i, a plan view of a part of the construction shown in Fig. l on an enlarged scale, and showing an operating-lever and a cam disk forming part of said mechanism and in a diierent position from that shown in Fig. l; Fig. 7, a plan view of the separate parts of the cam-disk shown in Fig. 6, said parts in practice being secured together, as shown in Fig. S; Fig. S, an enlarged section on the line S S of Fig. G, and Fig. 9 a detail view of certain parts of the construction shown in Fig. l.

In the drawings I have shown a watchwork frame or casing of the usual form and construction and comprising side plates ct and a2, connected in any desired manner, and in the practice of my invention I form in the plate ct a cavity d, of a depth about equal to the thickness of said plate and one side of which is cut away, as shown at d2, to allow the internal mechanism of the watch to have direct connection with the parts of my improvement which are arranged above the plate d. I also provide the usual barrel b and drive-wheel connected with a pinion b2,formed upon a main arbor d3, which is also provided with agear-wheel b3, which actuates the pinion b, mounted upon a statt 4b, which also carries a gear-wheel b5, and this gear-wheel is connected with a pinion b, which is secured t0 a sta 6b, also carrying a gear-wheel If, which in practice is connected with a balance-wheel or escapement and hair-spring in the usual manner, these parts being not shown. The gear-wheel if also actuates a pinion c, loosely mounted on the end of the main arbor cl3, as shown in Fig. 5, and the pinion o has the samenumber of teeth as the pinion 29"', and each being connected with the gear-wheel b5 their movement is therefore the same. The main arbor d3 carries the minutehand 3, and upon the staff 6b of the pinion b is mounted the usual seconds-hand, which is not shown, aud,'as will be readily understood, when the pinion b and the staff 6b make a complete revolution the pinion o also marks a complete revolution. The upper end of the pinion c is provided with small radial teeth, which engage with corresponding teeth ou a clutch-sleeve c2, to which is secured adisk or cam c3, which is heart-shaped, and both the clutch-sleeve ci andthe cam c3 are secured on a center arbor c, near one end thereof, said center arbor being passed loosely through the main arbor cl3, and on the center arbor c4 is mounted a sweep seconds-hand 4C. Above the cam c3 is a bridge e, in which the inner end of the staff c* revolves, and said guido is secured to the plate ct, and mounted upon the bridge e and exerting pressure upon the center arbor c4 is a spring e2, the force of which tends to keep the contiguous ends of the clutch-sleeve c2 and pinion c in close connection. Y

In the inner side of the plate c, are two hangersor supports e3 and e4, in which is slidably mounted a rod f, which extends beyond the outer end of the plate a and near the center of which is set at right angles thereto a pinfz, which passes through a slot f3 in the plate d, and the pin f2 projects slightly above the plate, and mounted upon the rod f and between the hangers or supports eand e4 is a coil-spring f4, the function of which is to force the pin f2 and rod fback to their normal position after the said pin and rod have been pushed inwardly by means` of the force applied to the outer end of the rod f. Adjacent to the slot f3 and pin f2 and upon the outer side of the plate a is mounted a double cam-disk g, which consists of two parts g2 and g3, (shown in Fig. 7,) and the lower orinner member g2 of which is provided with siX radial teeth in the same concentric circle, each of which has a radial face on its righthand side and calculated to be engaged by the pin f2 when the rod j' is forced inwardly. The upper or outer member g3 of the camdisk g is also provided with four teeth or projections arranged in two different concentric circles, this member of said disk being oblong in form and the teeth beingin different concentric circles, and said pairs of teeth are designated by the reference characters g5 and Q6, respectively, and all of said teeth have radial faces on the right-hand side thereof,and these two cam-disk members g2 and g3 are secured together in any desired manner or may be made integrally and are revolubly mounted on a screw g4. I also provide an operating-lever h, which is preferably S-shaped in form and is pivotally secured to the plate d by means of a screw h3, and one end h2 of this lever engages with the teeth of the upper camdiskmemberg. Theotherend 7t4ofthelever h is provided with two projections h5, placed far enough apart to allow of the free passage between the same of the drum ci, and the upper or outer faces of these projections are preferably inclined from their inner ends to their outer ends, as shown in Figs. 3 and 5. I also provide a double-ended spring t', which is secured at its center to the plate (t and which is yoke-shaped in form and the end 712 of which engages the teeth of the lower camdisk member g2 of the cam-disk g and prevents too great or toofree movement thereof, and the other end i3 of the spring 1I exerts pressure upon the end h4 of the operatinglever It, so as to keep the end h2 thereof in close contact with the cam-disk member g3.

As Will be understood, the turning of the cam-disk g by means of the pin f2 and rodf will cause the arm h2 of the lever h to approach or recede from the center of said cam, thereby giving the other arm h4 of the lever 7L a greater movement, thus causing it to approach or recede from the drum c2. The arm h4 is provided at its base or the inner ends of the projections h5 with an outwardlydirected V-shaped portion hLwhich is slightly higher than the inner ends of the projections h5, and the object of which is to force the heart-cam c3 into a predetermined position whenever the V-shaped portion h5 comes in contact therewith, as is clearly shown in Fig. 6.

The extreme outer position of the parts just described is shown in Fig. l, and the eXtreme inner position of these parts is shown in Fig. 6. When the watch is in operation, the seconds-hand on the staff 6b of the pinion h6 and which is not shown and the sweep secondshand 4 upon the center arbor c4 are moving in the same direction and with the same speed when the operating parts of my invention are in their normal position, as shown in Fig. 1, and pressure applied to the rod fcanses the cam-disk g to make one-sixth of a revolution, and the pin f2 and rodf, being loosely mounted in the hangers or supports e3 and e4, are forced back to their normal position by the spring f4, and the arm h2 of the operating-lever 7L, by means of pressure exerted by the spring t3, drops into engagement with the concentrically-arranged teeth on the. camdisk g3, and as the arm h4 approaches the clutch-sleeve c2 the projections h5 pass under the heart-cam c3, which cause their inclined shape to operate to raise the cam c3 and the clutch-sleeve c2 and center arbor c4, secured thereto, thereby engaging the surfaces of the clutch-sleeve c2 and pinion c, and

this operation stops the motion of the cam c3,

clutch-sleeve c2, and centerl arbor c4, together with the sweep seconds-hand secured thereto, although the pinion c and the other parts of the Watch continue to operate in the usual manner. The rod f being again forced in- Wardly, the cam-disk g is again turned onesixth of a revolution, and the arm h2 of the operating-lever drops into engagement with the innermost tooth on the cam-disk member g3, and the arm h4 is at its eXtreme inward movement, and,as hereinbefore described,the

heart-shaped cam c3 is turned to the position shown in Fig. 6. When the heart-cam c3 is in this position, the sweep seconds-hand is at its starting-point, and as the heart-cam is always forced back into the position shown in Fig. 6 when the operating-lever h is in its eXtreme inward position it will be seen that the sweep seconds-hand will always Iiy back when the parts are in their proper position. The rod f being again forced inwardly, the lever h is forced back to its extreme outer position, as shown in Fig. l, and the heartcam c3 is released and the spring e2 forces the clutch-sleeve c2into operative connection with the pinion c, and the sweep seconds-hand again starts upon its regular movement. When an event is to be timed, the rod f is pushed twice and the sweep seconds-hand ilies back to its starting-point, the watch still con- IOO IIO

tinuing to run in the usual manner. As soon as the beginningr of the event-say a horse- -race, boat-race, or other event -is made the rod fis again pushed and the sweep secondshand starts on its regular revolution and contin ues to move until the rod/'is again pressed, when the sweep seconds-hand stops, as hereinbefore described, and the event is thus timed. When it is desired to start the sweep secondshand, one push on the rod fcauses the hand to ly back to its starting-point and another push on said rod releases the cam c3,and thereby the sweep seconds-hand, and its movement is again resumed. Thespring/may besecured t0 the plate a in any desired manner; but I prefer to employ the means shown in Fig. 9 for this purpose, and in this construction I provide the spring t' with a longitudinal projection k and form in the plate ct a slot 7a2, adapted to 'receive said projection, and the width of the-said projection is slightly greater than the thickness of the plate (t, and when the parts have been connected by passingthe projection k through the slot 7a2 a fewtaps of a hammer will secure the projection in said slot and securely connect the spring with said plate.

This improvement is simple in construction and operation and perfectly adapted to accomplish the result for which it is intended, and changes in and modifications of the construction dcscribed may be made without departing from the spirit of my invention or sacrificing its advantages, and it will also be apparent that the ily-back attachment of the sweep seconds-hand of the watch, hereinbefore described, may be applied to any form of construction of watch now in use.

Having fully described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a fly-back attachment for watches, the combination with one of the plates of the frame ofa watch mechanism,of a yoke-shaped spring secured to said plate at the middle thereof, a double cam-disk mounted on said plate, one member of which is in operative connection with one arm of said spring, and a lever adapted to engage with the other member of said cam-disk, said lever being in operative connection with the other arm of said spring, substantially as shown and described.

2. In afly-back attachment for watches, the combination with one of the plates of the frame of the Watch mechanism, of a yokeshaped spring secured to said plate at the middle thereof, a double cam-disk mounted on said plate, one member of which is in operative connection With one arm of said spring, and a lever adapted to engage with the other member of said cam-disk, said lever being in operative connection with the other arm of said spring, and means for operating said double cam-disk, substantially as shown and described.

3. In a fly-back attachment for watches provided with a hollow main arbor, a center arbor longitudinally and rotatably movable therein and provided at one end with the usual sweep seconds-hand and at the other end with a heart-shaped cam and means for locking said center arbor to said main arbor as well as releasing the same; an operatinglever pivotally mounted at or near its center and adjacent to said center arbor, and provided with two curved projecting` members which are wedge-shaped in longitudinal vertical section, and which are adapted to pass one on each side of said center arbor and engage, with their inclined surfaces, the under side of said heart-shaped cam, said operatinglever being also provided between the inner ends of said curved Wedge-shaped members with a thickened projecting member which is Wedge-shaped in transverse horizontal section, and adapted to engage the recess in the periphery of said heart-shaped cam, and means for operating said lever, substantially as shown and described.

4. In a fly-back attachment for watches provided with a main arbor, a center arbor movable therein and provided at one end with a sweep seconds-hand and at the other With a heart-shaped cam, and means for locking said center arbor to said main arbor and releasing it therefrom; a double cam-disk, an operating-lever one end of which is provided with wedge-shaped projecting members adapted to operate in connection with said heart-shaped cam and the other end of which is in operative connection With the outer member of said double cam-disk, a yoke-shaped spring one end of which operates on one end of said lever and the other end of which operates on the inner member of said double cam-disk, a spring-operated rod loosely mounted adjacent to said double cam-disk, and a pin secured at right angles thereto, and adapted to operate on the inner member of said double cam-disk, substantially as shown and described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of` the subscribing witnesses, this 10th day of May, 1902.

MORRIS BASSOFF.

Witnesses:

F. A. STEWART, C. E. MULREANY.

IOO

IIO 

